XF 2.1 Creating a close thread button?

[Joe Link]

I'd like to add a close thread button to the thread view header.

I've tried this but I get the error message "This action is available via POST only. Please press the back button and try again".

<xf:button class="button--primary" href="{{ link('threads/quick-close', $thread) }}">
    Close Thread
</xf:button>

I've also tried a traditional link and got the same error message.

<xf:button class="button--primary" href="/quick-close">
    Close Thread
</xf:button>

Adding data-xf-click="switch" makes it work, but then it toggles between an open and close button (I only want a close button). Ideally the page would reload when the button is clicked.